<template>
  <span>{{
    hour
      ? hourString + "h" + minuteString + "min" + secondString
      : minuteString + "sec" + secondString
  }}</span>
</template>

<script>
export default {
  data() {
    return {
      hour: "",
      minute: "",
      second: "",
      timer: "",
    };
  },
  props: {
    remainTime: {
      // 倒计时间总秒数
      default: "12312312",
    },
  },
  mounted() {
    if (this.remainTime > 0) {
      this.hour = Math.floor((this.remainTime / 3600) % 24);
      this.minute = Math.floor((this.remainTime / 60) % 60);
      this.second = Math.floor(this.remainTime % 60);
      this.countDowm();
    }
  },
  methods: {
    countDowm() {
      var self = this;
      clearInterval(this.timer);
      this.timer = setInterval(function () {
        if (self.hour === 0) {
          if (self.minute !== 0 && self.second === 0) {
            self.second = 59;
            self.minute -= 1;
          } else if (self.minute === 0 && self.second === 0) {
            self.second = 0;
            self.$emit("countDowmEnd", true);
            clearInterval(self.timer);
          } else {
            self.second -= 1;
          }
        } else {
          if (self.minute !== 0 && self.second === 0) {
            self.second = 59;
            self.minute -= 1;
          } else if (self.minute === 0 && self.second === 0) {
            self.hour -= 1;
            self.minute = 59;
            self.second = 59;
          } else {
            self.second -= 1;
          }
        }
      }, 1000);
    },
    formatNum(num) {
      return num < 10 ? "0" + num : "" + num;
    },
  },
  computed: {
    hourString() {
      return this.formatNum(this.hour);
    },
    minuteString() {
      return this.formatNum(this.minute);
    },
    secondString() {
      return this.formatNum(this.second);
    },
  },
};
</script>